Fulgêncio, FernandoSábio, Rafael [UNESP]Ribeiro, Sidney. J. [UNESP]Oliveira, Fernando C.Borges, Alex S.Araujo, Maria H.Windmöller, DarioMarques-Netto, AntônioMachado, José C.Magalhães, Welington F.2020-12-122020-12-122019-12-27AIP Conference Proceedings, v. 2182.1551-76160094-243Xhttp://hdl.handle.net/11449/198400Positron annihilation lifetime (PALS) and optical spectroscopies measurements were performed in Sm3+, Eu3+ and Gd3+ dipivaloylmethanate complexes, Ln(dpm)3 (dpm = 2,2,6,6-tetramethyl-3,5-pentanedionate), and also on their binary solid solutions of general formula Ln1-xEux(dpm)3, where Ln = Sm3+ or Gd3+. The results indicate that photophysical processes present in the solid solutions, such as a ligand-to-metal charge transfer (LMCT), and Sm3+ ? Eu3+ energy transfers, are strongly related to the positronium (Ps) formation probability. The results were interpreted from a kinetic model involving the participation of excited states in the Ps formation that we are calling correlated cybotactic system kinetic mechanism (CCSKM).engTrabalho apresentado em evento10.1063/1.51358662-s2.0-85077872171